2 * IDE ATAPI streaming tape driver.
4 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il>
5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz
7 * This driver was constructed as a student project in the software laboratory
8 * of the faculty of electrical engineering in the Technion - Israel's
9 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
11 * It is hereby placed under the terms of the GNU general public license.
12 * (See linux/COPYING).
14 * For a historical changelog see
15 * Documentation/ide/ChangeLog.ide-tape.1995-2002
18 #define IDETAPE_VERSION "1.20"
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/string.h>
23 #include <linux/kernel.h>
24 #include <linux/delay.h>
25 #include <linux/timer.h>
27 #include <linux/interrupt.h>
28 #include <linux/jiffies.h>
29 #include <linux/major.h>
30 #include <linux/errno.h>
31 #include <linux/genhd.h>
32 #include <linux/slab.h>
33 #include <linux/pci.h>
34 #include <linux/ide.h>
35 #include <linux/smp_lock.h>
36 #include <linux/completion.h>
37 #include <linux/bitops.h>
38 #include <linux/mutex.h>
39 #include <scsi/scsi.h>
41 #include <asm/byteorder.h>
42 #include <linux/irq.h>
43 #include <linux/uaccess.h>
45 #include <asm/unaligned.h>
46 #include <linux/mtio.h>
49 /* output errors only */
51 /* output all sense key/asc */
53 /* info regarding all chrdev-related procedures */
54 DBG_CHRDEV
= (1 << 2),
55 /* all remaining procedures */
57 /* buffer alloc info (pc_stack & rq_stack) */
58 DBG_PCRQ_STACK
= (1 << 4),
61 /* define to see debug info */
62 #define IDETAPE_DEBUG_LOG 0
65 #define debug_log(lvl, fmt, args...) \
67 if (tape->debug_mask & lvl) \
68 printk(KERN_INFO "ide-tape: " fmt, ## args); \
71 #define debug_log(lvl, fmt, args...) do {} while (0)
74 /**************************** Tunable parameters *****************************/
76 * After each failed packet command we issue a request sense command and retry
77 * the packet command IDETAPE_MAX_PC_RETRIES times.
79 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
81 #define IDETAPE_MAX_PC_RETRIES 3
84 * With each packet command, we allocate a buffer of IDETAPE_PC_BUFFER_SIZE
85 * bytes. This is used for several packet commands (Not for READ/WRITE commands)
87 #define IDETAPE_PC_BUFFER_SIZE 256
90 * In various places in the driver, we need to allocate storage
91 * for packet commands and requests, which will remain valid while
92 * we leave the driver to wait for an interrupt or a timeout event.
94 #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
97 * Some drives (for example, Seagate STT3401A Travan) require a very long
98 * timeout, because they don't return an interrupt or clear their busy bit
99 * until after the command completes (even retension commands).
101 #define IDETAPE_WAIT_CMD (900*HZ)
104 * The following parameter is used to select the point in the internal tape fifo
105 * in which we will start to refill the buffer. Decreasing the following
106 * parameter will improve the system's latency and interactive response, while
107 * using a high value might improve system throughput.
109 #define IDETAPE_FIFO_THRESHOLD 2
112 * DSC polling parameters.
114 * Polling for DSC (a single bit in the status register) is a very important
115 * function in ide-tape. There are two cases in which we poll for DSC:
117 * 1. Before a read/write packet command, to ensure that we can transfer data
118 * from/to the tape's data buffers, without causing an actual media access.
119 * In case the tape is not ready yet, we take out our request from the device
120 * request queue, so that ide.c could service requests from the other device
121 * on the same interface in the meantime.
123 * 2. After the successful initialization of a "media access packet command",
124 * which is a command that can take a long time to complete (the interval can
125 * range from several seconds to even an hour). Again, we postpone our request
126 * in the middle to free the bus for the other device. The polling frequency
127 * here should be lower than the read/write frequency since those media access
128 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
129 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
130 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
132 * We also set a timeout for the timer, in case something goes wrong. The
133 * timeout should be longer then the maximum execution time of a tape operation.
137 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
138 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
139 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
140 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
141 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
142 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
143 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
145 /*************************** End of tunable parameters ***********************/
147 /* Read/Write error simulation */
148 #define SIMULATE_ERRORS 0
150 /* tape directions */
152 IDETAPE_DIR_NONE
= (1 << 0),
153 IDETAPE_DIR_READ
= (1 << 1),
154 IDETAPE_DIR_WRITE
= (1 << 2),
160 struct idetape_bh
*b_reqnext
;
164 /* Tape door status */
165 #define DOOR_UNLOCKED 0
166 #define DOOR_LOCKED 1
167 #define DOOR_EXPLICITLY_LOCKED 2
169 /* Some defines for the SPACE command */
170 #define IDETAPE_SPACE_OVER_FILEMARK 1
171 #define IDETAPE_SPACE_TO_EOD 3
173 /* Some defines for the LOAD UNLOAD command */
174 #define IDETAPE_LU_LOAD_MASK 1
175 #define IDETAPE_LU_RETENSION_MASK 2
176 #define IDETAPE_LU_EOT_MASK 4
179 * Special requests for our block device strategy routine.
181 * In order to service a character device command, we add special requests to
182 * the tail of our block device request queue and wait for their completion.
186 REQ_IDETAPE_PC1
= (1 << 0), /* packet command (first stage) */
187 REQ_IDETAPE_PC2
= (1 << 1), /* packet command (second stage) */
188 REQ_IDETAPE_READ
= (1 << 2),
189 REQ_IDETAPE_WRITE
= (1 << 3),
192 /* Error codes returned in rq->errors to the higher part of the driver. */
193 #define IDETAPE_ERROR_GENERAL 101
194 #define IDETAPE_ERROR_FILEMARK 102
195 #define IDETAPE_ERROR_EOD 103
197 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
198 #define IDETAPE_BLOCK_DESCRIPTOR 0
199 #define IDETAPE_CAPABILITIES_PAGE 0x2a
201 /* Tape flag bits values. */
203 IDETAPE_FLAG_IGNORE_DSC
= (1 << 0),
204 /* 0 When the tape position is unknown */
205 IDETAPE_FLAG_ADDRESS_VALID
= (1 << 1),
206 /* Device already opened */
207 IDETAPE_FLAG_BUSY
= (1 << 2),
208 /* Attempt to auto-detect the current user block size */
209 IDETAPE_FLAG_DETECT_BS
= (1 << 3),
210 /* Currently on a filemark */
211 IDETAPE_FLAG_FILEMARK
= (1 << 4),
212 /* DRQ interrupt device */
213 IDETAPE_FLAG_DRQ_INTERRUPT
= (1 << 5),
214 /* 0 = no tape is loaded, so we don't rewind after ejecting */
215 IDETAPE_FLAG_MEDIUM_PRESENT
= (1 << 6),
218 /* A pipeline stage. */
219 typedef struct idetape_stage_s
{
220 struct request rq
; /* The corresponding request */
221 struct idetape_bh
*bh
; /* The data buffers */
222 struct idetape_stage_s
*next
; /* Pointer to the next stage */
226 * Most of our global data which we need to save even as we leave the driver due
227 * to an interrupt or a timer event is stored in the struct defined below.
229 typedef struct ide_tape_obj
{
231 ide_driver_t
*driver
;
232 struct gendisk
*disk
;
236 * Since a typical character device operation requires more
237 * than one packet command, we provide here enough memory
238 * for the maximum of interconnected packet commands.
239 * The packet commands are stored in the circular array pc_stack.
240 * pc_stack_index points to the last used entry, and warps around
241 * to the start when we get to the last array entry.
243 * pc points to the current processed packet command.
245 * failed_pc points to the last failed packet command, or contains
246 * NULL if we do not need to retry any packet command. This is
247 * required since an additional packet command is needed before the
248 * retry, to get detailed information on what went wrong.
250 /* Current packet command */
251 struct ide_atapi_pc
*pc
;
252 /* Last failed packet command */
253 struct ide_atapi_pc
*failed_pc
;
254 /* Packet command stack */
255 struct ide_atapi_pc pc_stack
[IDETAPE_PC_STACK
];
256 /* Next free packet command storage space */
258 struct request rq_stack
[IDETAPE_PC_STACK
];
259 /* We implement a circular array */
263 * DSC polling variables.
265 * While polling for DSC we use postponed_rq to postpone the current
266 * request so that ide.c will be able to service pending requests on the
267 * other device. Note that at most we will have only one DSC (usually
268 * data transfer) request in the device request queue.
270 struct request
*postponed_rq
;
271 /* The time in which we started polling for DSC */
272 unsigned long dsc_polling_start
;
273 /* Timer used to poll for dsc */
274 struct timer_list dsc_timer
;
275 /* Read/Write dsc polling frequency */
276 unsigned long best_dsc_rw_freq
;
277 unsigned long dsc_poll_freq
;
278 unsigned long dsc_timeout
;
280 /* Read position information */
283 unsigned int first_frame
;
285 /* Last error information */
286 u8 sense_key
, asc
, ascq
;
288 /* Character device operation */
292 /* Current character device data transfer direction */
295 /* tape block size, usually 512 or 1024 bytes */
296 unsigned short blk_size
;
299 /* Copy of the tape's Capabilities and Mechanical Page */
303 * Active data transfer request parameters.
305 * At most, there is only one ide-tape originated data transfer request
306 * in the device request queue. This allows ide.c to easily service
307 * requests from the other device when we postpone our active request.
310 /* Data buffer size chosen based on the tape's recommendation */
312 idetape_stage_t
*merge_stage
;
313 int merge_stage_size
;
314 struct idetape_bh
*bh
;
318 /* Pipeline parameters. */
320 /* Wasted space in each stage */
323 /* Status/Action flags: long for set_bit */
325 /* protects the ide-tape queue */
328 /* Measures average tape speed */
329 unsigned long avg_time
;
333 /* the door is currently locked */
335 /* the tape hardware is write protected */
337 /* the tape is write protected (hardware or opened as read-only) */
343 static DEFINE_MUTEX(idetape_ref_mutex
);
345 static struct class *idetape_sysfs_class
;
347 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
349 #define ide_tape_g(disk) \
350 container_of((disk)->private_data, struct ide_tape_obj, driver)
352 static struct ide_tape_obj
*ide_tape_get(struct gendisk
*disk
)
354 struct ide_tape_obj
*tape
= NULL
;
356 mutex_lock(&idetape_ref_mutex
);
357 tape
= ide_tape_g(disk
);
359 kref_get(&tape
->kref
);
360 mutex_unlock(&idetape_ref_mutex
);
364 static void ide_tape_release(struct kref
*);
366 static void ide_tape_put(struct ide_tape_obj
*tape
)
368 mutex_lock(&idetape_ref_mutex
);
369 kref_put(&tape
->kref
, ide_tape_release
);
370 mutex_unlock(&idetape_ref_mutex
);
374 * The variables below are used for the character device interface. Additional
375 * state variables are defined in our ide_drive_t structure.
377 static struct ide_tape_obj
*idetape_devs
[MAX_HWIFS
* MAX_DRIVES
];
379 #define ide_tape_f(file) ((file)->private_data)
381 static struct ide_tape_obj
*ide_tape_chrdev_get(unsigned int i
)
383 struct ide_tape_obj
*tape
= NULL
;
385 mutex_lock(&idetape_ref_mutex
);
386 tape
= idetape_devs
[i
];
388 kref_get(&tape
->kref
);
389 mutex_unlock(&idetape_ref_mutex
);
393 static void idetape_input_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
396 struct idetape_bh
*bh
= pc
->bh
;
401 printk(KERN_ERR
"ide-tape: bh == NULL in "
402 "idetape_input_buffers\n");
403 ide_atapi_discard_data(drive
, bcount
);
407 (unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)),
409 HWIF(drive
)->atapi_input_bytes(drive
, bh
->b_data
+
410 atomic_read(&bh
->b_count
), count
);
412 atomic_add(count
, &bh
->b_count
);
413 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
416 atomic_set(&bh
->b_count
, 0);
422 static void idetape_output_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
425 struct idetape_bh
*bh
= pc
->bh
;
430 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
434 count
= min((unsigned int)pc
->b_count
, (unsigned int)bcount
);
435 HWIF(drive
)->atapi_output_bytes(drive
, pc
->b_data
, count
);
438 pc
->b_count
-= count
;
443 pc
->b_data
= bh
->b_data
;
444 pc
->b_count
= atomic_read(&bh
->b_count
);
450 static void idetape_update_buffers(struct ide_atapi_pc
*pc
)
452 struct idetape_bh
*bh
= pc
->bh
;
454 unsigned int bcount
= pc
->xferred
;
456 if (pc
->flags
& PC_FLAG_WRITING
)
460 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
464 count
= min((unsigned int)bh
->b_size
, (unsigned int)bcount
);
465 atomic_set(&bh
->b_count
, count
);
466 if (atomic_read(&bh
->b_count
) == bh
->b_size
)
474 * idetape_next_pc_storage returns a pointer to a place in which we can
475 * safely store a packet command, even though we intend to leave the
476 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
477 * commands is allocated at initialization time.
479 static struct ide_atapi_pc
*idetape_next_pc_storage(ide_drive_t
*drive
)
481 idetape_tape_t
*tape
= drive
->driver_data
;
483 debug_log(DBG_PCRQ_STACK
, "pc_stack_index=%d\n", tape
->pc_stack_index
);
485 if (tape
->pc_stack_index
== IDETAPE_PC_STACK
)
486 tape
->pc_stack_index
= 0;
487 return (&tape
->pc_stack
[tape
->pc_stack_index
++]);
491 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
492 * Since we queue packet commands in the request queue, we need to
493 * allocate a request, along with the allocation of a packet command.
496 /**************************************************************
498 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
499 * followed later on by kfree(). -ml *
501 **************************************************************/
503 static struct request
*idetape_next_rq_storage(ide_drive_t
*drive
)
505 idetape_tape_t
*tape
= drive
->driver_data
;
507 debug_log(DBG_PCRQ_STACK
, "rq_stack_index=%d\n", tape
->rq_stack_index
);
509 if (tape
->rq_stack_index
== IDETAPE_PC_STACK
)
510 tape
->rq_stack_index
= 0;
511 return (&tape
->rq_stack
[tape
->rq_stack_index
++]);
514 static void idetape_init_pc(struct ide_atapi_pc
*pc
)
516 memset(pc
->c
, 0, 12);
520 pc
->buf
= pc
->pc_buf
;
521 pc
->buf_size
= IDETAPE_PC_BUFFER_SIZE
;
527 * called on each failed packet command retry to analyze the request sense. We
528 * currently do not utilize this information.
530 static void idetape_analyze_error(ide_drive_t
*drive
, u8
*sense
)
532 idetape_tape_t
*tape
= drive
->driver_data
;
533 struct ide_atapi_pc
*pc
= tape
->failed_pc
;
535 tape
->sense_key
= sense
[2] & 0xF;
536 tape
->asc
= sense
[12];
537 tape
->ascq
= sense
[13];
539 debug_log(DBG_ERR
, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
540 pc
->c
[0], tape
->sense_key
, tape
->asc
, tape
->ascq
);
542 /* Correct pc->xferred by asking the tape. */
543 if (pc
->flags
& PC_FLAG_DMA_ERROR
) {
544 pc
->xferred
= pc
->req_xfer
-
546 be32_to_cpu(get_unaligned((u32
*)&sense
[3]));
547 idetape_update_buffers(pc
);
551 * If error was the result of a zero-length read or write command,
552 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
553 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
555 if ((pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
)
557 && pc
->c
[4] == 0 && pc
->c
[3] == 0 && pc
->c
[2] == 0) {
558 if (tape
->sense_key
== 5) {
559 /* don't report an error, everything's ok */
561 /* don't retry read/write */
562 pc
->flags
|= PC_FLAG_ABORT
;
565 if (pc
->c
[0] == READ_6
&& (sense
[2] & 0x80)) {
566 pc
->error
= IDETAPE_ERROR_FILEMARK
;
567 pc
->flags
|= PC_FLAG_ABORT
;
569 if (pc
->c
[0] == WRITE_6
) {
570 if ((sense
[2] & 0x40) || (tape
->sense_key
== 0xd
571 && tape
->asc
== 0x0 && tape
->ascq
== 0x2)) {
572 pc
->error
= IDETAPE_ERROR_EOD
;
573 pc
->flags
|= PC_FLAG_ABORT
;
576 if (pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
) {
577 if (tape
->sense_key
== 8) {
578 pc
->error
= IDETAPE_ERROR_EOD
;
579 pc
->flags
|= PC_FLAG_ABORT
;
581 if (!(pc
->flags
& PC_FLAG_ABORT
) &&
583 pc
->retries
= IDETAPE_MAX_PC_RETRIES
+ 1;
587 /* Free a stage along with its related buffers completely. */
588 static void __idetape_kfree_stage(idetape_stage_t
*stage
)
590 struct idetape_bh
*prev_bh
, *bh
= stage
->bh
;
594 if (bh
->b_data
!= NULL
) {
595 size
= (int) bh
->b_size
;
597 free_page((unsigned long) bh
->b_data
);
599 bh
->b_data
+= PAGE_SIZE
;
609 static int idetape_end_request(ide_drive_t
*drive
, int uptodate
, int nr_sects
)
611 struct request
*rq
= HWGROUP(drive
)->rq
;
612 idetape_tape_t
*tape
= drive
->driver_data
;
616 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
619 case 0: error
= IDETAPE_ERROR_GENERAL
; break;
620 case 1: error
= 0; break;
621 default: error
= uptodate
;
625 tape
->failed_pc
= NULL
;
627 if (!blk_special_request(rq
)) {
628 ide_end_request(drive
, uptodate
, nr_sects
);
632 spin_lock_irqsave(&tape
->lock
, flags
);
634 ide_end_drive_cmd(drive
, 0, 0);
636 spin_unlock_irqrestore(&tape
->lock
, flags
);
640 static ide_startstop_t
idetape_request_sense_callback(ide_drive_t
*drive
)
642 idetape_tape_t
*tape
= drive
->driver_data
;
644 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
646 if (!tape
->pc
->error
) {
647 idetape_analyze_error(drive
, tape
->pc
->buf
);
648 idetape_end_request(drive
, 1, 0);
650 printk(KERN_ERR
"ide-tape: Error in REQUEST SENSE itself - "
651 "Aborting request!\n");
652 idetape_end_request(drive
, 0, 0);
657 static void idetape_create_request_sense_cmd(struct ide_atapi_pc
*pc
)
660 pc
->c
[0] = REQUEST_SENSE
;
663 pc
->idetape_callback
= &idetape_request_sense_callback
;
666 static void idetape_init_rq(struct request
*rq
, u8 cmd
)
668 memset(rq
, 0, sizeof(*rq
));
669 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
674 * Generate a new packet command request in front of the request queue, before
675 * the current request, so that it will be processed immediately, on the next
676 * pass through the driver. The function below is called from the request
677 * handling part of the driver (the "bottom" part). Safe storage for the request
678 * should be allocated with ide_tape_next_{pc,rq}_storage() prior to that.
680 * Memory for those requests is pre-allocated at initialization time, and is
681 * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for
682 * the maximum possible number of inter-dependent packet commands.
684 * The higher level of the driver - The ioctl handler and the character device
685 * handling functions should queue request to the lower level part and wait for
686 * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail.
688 static void idetape_queue_pc_head(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
691 struct ide_tape_obj
*tape
= drive
->driver_data
;
693 idetape_init_rq(rq
, REQ_IDETAPE_PC1
);
694 rq
->buffer
= (char *) pc
;
695 rq
->rq_disk
= tape
->disk
;
696 (void) ide_do_drive_cmd(drive
, rq
, ide_preempt
);
700 * idetape_retry_pc is called when an error was detected during the
701 * last packet command. We queue a request sense packet command in
702 * the head of the request list.
704 static ide_startstop_t
idetape_retry_pc (ide_drive_t
*drive
)
706 idetape_tape_t
*tape
= drive
->driver_data
;
707 struct ide_atapi_pc
*pc
;
710 (void)ide_read_error(drive
);
711 pc
= idetape_next_pc_storage(drive
);
712 rq
= idetape_next_rq_storage(drive
);
713 idetape_create_request_sense_cmd(pc
);
714 set_bit(IDETAPE_FLAG_IGNORE_DSC
, &tape
->flags
);
715 idetape_queue_pc_head(drive
, pc
, rq
);
720 * Postpone the current request so that ide.c will be able to service requests
721 * from another device on the same hwgroup while we are polling for DSC.
723 static void idetape_postpone_request(ide_drive_t
*drive
)
725 idetape_tape_t
*tape
= drive
->driver_data
;
727 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
729 tape
->postponed_rq
= HWGROUP(drive
)->rq
;
730 ide_stall_queue(drive
, tape
->dsc_poll_freq
);
733 typedef void idetape_io_buf(ide_drive_t
*, struct ide_atapi_pc
*, unsigned int);
736 * This is the usual interrupt handler which will be called during a packet
737 * command. We will transfer some of the data (as requested by the drive) and
738 * will re-point interrupt handler to us. When data transfer is finished, we
739 * will act according to the algorithm described before
742 static ide_startstop_t
idetape_pc_intr(ide_drive_t
*drive
)
744 ide_hwif_t
*hwif
= drive
->hwif
;
745 idetape_tape_t
*tape
= drive
->driver_data
;
746 struct ide_atapi_pc
*pc
= tape
->pc
;
747 xfer_func_t
*xferfunc
;
748 idetape_io_buf
*iobuf
;
751 static int error_sim_count
;
756 debug_log(DBG_PROCS
, "Enter %s - interrupt handler\n", __func__
);
758 /* Clear the interrupt */
759 stat
= ide_read_status(drive
);
761 if (pc
->flags
& PC_FLAG_DMA_IN_PROGRESS
) {
762 if (hwif
->dma_ops
->dma_end(drive
) || (stat
& ERR_STAT
)) {
764 * A DMA error is sometimes expected. For example,
765 * if the tape is crossing a filemark during a
766 * READ command, it will issue an irq and position
767 * itself before the filemark, so that only a partial
768 * data transfer will occur (which causes the DMA
769 * error). In that case, we will later ask the tape
770 * how much bytes of the original request were
771 * actually transferred (we can't receive that
772 * information from the DMA engine on most chipsets).
776 * On the contrary, a DMA error is never expected;
777 * it usually indicates a hardware error or abort.
778 * If the tape crosses a filemark during a READ
779 * command, it will issue an irq and position itself
780 * after the filemark (not before). Only a partial
781 * data transfer will occur, but no DMA error.
784 pc
->flags
|= PC_FLAG_DMA_ERROR
;
786 pc
->xferred
= pc
->req_xfer
;
787 idetape_update_buffers(pc
);
789 debug_log(DBG_PROCS
, "DMA finished\n");
793 /* No more interrupts */
794 if ((stat
& DRQ_STAT
) == 0) {
795 debug_log(DBG_SENSE
, "Packet command completed, %d bytes"
796 " transferred\n", pc
->xferred
);
798 pc
->flags
&= ~PC_FLAG_DMA_IN_PROGRESS
;
802 if ((pc
->c
[0] == WRITE_6
|| pc
->c
[0] == READ_6
) &&
803 (++error_sim_count
% 100) == 0) {
804 printk(KERN_INFO
"ide-tape: %s: simulating error\n",
809 if ((stat
& ERR_STAT
) && pc
->c
[0] == REQUEST_SENSE
)
811 if ((stat
& ERR_STAT
) || (pc
->flags
& PC_FLAG_DMA_ERROR
)) {
813 debug_log(DBG_ERR
, "%s: I/O error\n", tape
->name
);
815 if (pc
->c
[0] == REQUEST_SENSE
) {
816 printk(KERN_ERR
"ide-tape: I/O error in request"
818 return ide_do_reset(drive
);
820 debug_log(DBG_ERR
, "[cmd %x]: check condition\n",
823 /* Retry operation */
824 return idetape_retry_pc(drive
);
827 if ((pc
->flags
& PC_FLAG_WAIT_FOR_DSC
) &&
828 (stat
& SEEK_STAT
) == 0) {
829 /* Media access command */
830 tape
->dsc_polling_start
= jiffies
;
831 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_FAST
;
832 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_MA_TIMEOUT
;
833 /* Allow ide.c to handle other requests */
834 idetape_postpone_request(drive
);
837 if (tape
->failed_pc
== pc
)
838 tape
->failed_pc
= NULL
;
839 /* Command finished - Call the callback function */
840 return pc
->idetape_callback(drive
);
843 if (pc
->flags
& PC_FLAG_DMA_IN_PROGRESS
) {
844 pc
->flags
&= ~PC_FLAG_DMA_IN_PROGRESS
;
845 printk(KERN_ERR
"ide-tape: The tape wants to issue more "
846 "interrupts in DMA mode\n");
847 printk(KERN_ERR
"ide-tape: DMA disabled, reverting to PIO\n");
849 return ide_do_reset(drive
);
851 /* Get the number of bytes to transfer on this interrupt. */
852 bcount
= (hwif
->INB(hwif
->io_ports
.lbah_addr
) << 8) |
853 hwif
->INB(hwif
->io_ports
.lbam_addr
);
855 ireason
= hwif
->INB(hwif
->io_ports
.nsect_addr
);
858 printk(KERN_ERR
"ide-tape: CoD != 0 in %s\n", __func__
);
859 return ide_do_reset(drive
);
861 if (((ireason
& IO
) == IO
) == !!(pc
->flags
& PC_FLAG_WRITING
)) {
862 /* Hopefully, we will never get here */
863 printk(KERN_ERR
"ide-tape: We wanted to %s, ",
864 (ireason
& IO
) ? "Write" : "Read");
865 printk(KERN_ERR
"ide-tape: but the tape wants us to %s !\n",
866 (ireason
& IO
) ? "Read" : "Write");
867 return ide_do_reset(drive
);
869 if (!(pc
->flags
& PC_FLAG_WRITING
)) {
870 /* Reading - Check that we have enough space */
871 temp
= pc
->xferred
+ bcount
;
872 if (temp
> pc
->req_xfer
) {
873 if (temp
> pc
->buf_size
) {
874 printk(KERN_ERR
"ide-tape: The tape wants to "
875 "send us more data than expected "
876 "- discarding data\n");
877 ide_atapi_discard_data(drive
, bcount
);
878 ide_set_handler(drive
, &idetape_pc_intr
,
879 IDETAPE_WAIT_CMD
, NULL
);
882 debug_log(DBG_SENSE
, "The tape wants to send us more "
883 "data than expected - allowing transfer\n");
885 iobuf
= &idetape_input_buffers
;
886 xferfunc
= hwif
->atapi_input_bytes
;
888 iobuf
= &idetape_output_buffers
;
889 xferfunc
= hwif
->atapi_output_bytes
;
893 iobuf(drive
, pc
, bcount
);
895 xferfunc(drive
, pc
->cur_pos
, bcount
);
897 /* Update the current position */
898 pc
->xferred
+= bcount
;
899 pc
->cur_pos
+= bcount
;
901 debug_log(DBG_SENSE
, "[cmd %x] transferred %d bytes on that intr.\n",
904 /* And set the interrupt handler again */
905 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
910 * Packet Command Interface
912 * The current Packet Command is available in tape->pc, and will not change
913 * until we finish handling it. Each packet command is associated with a
914 * callback function that will be called when the command is finished.
916 * The handling will be done in three stages:
918 * 1. idetape_issue_pc will send the packet command to the drive, and will set
919 * the interrupt handler to idetape_pc_intr.
921 * 2. On each interrupt, idetape_pc_intr will be called. This step will be
922 * repeated until the device signals us that no more interrupts will be issued.
924 * 3. ATAPI Tape media access commands have immediate status with a delayed
925 * process. In case of a successful initiation of a media access packet command,
926 * the DSC bit will be set when the actual execution of the command is finished.
927 * Since the tape drive will not issue an interrupt, we have to poll for this
928 * event. In this case, we define the request as "low priority request" by
929 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
932 * ide.c will then give higher priority to requests which originate from the
933 * other device, until will change rq_status to RQ_ACTIVE.
935 * 4. When the packet command is finished, it will be checked for errors.
937 * 5. In case an error was found, we queue a request sense packet command in
938 * front of the request queue and retry the operation up to
939 * IDETAPE_MAX_PC_RETRIES times.
941 * 6. In case no error was found, or we decided to give up and not to retry
942 * again, the callback function will be called and then we will handle the next
945 static ide_startstop_t
idetape_transfer_pc(ide_drive_t
*drive
)
947 ide_hwif_t
*hwif
= drive
->hwif
;
948 idetape_tape_t
*tape
= drive
->driver_data
;
949 struct ide_atapi_pc
*pc
= tape
->pc
;
951 ide_startstop_t startstop
;
954 if (ide_wait_stat(&startstop
, drive
, DRQ_STAT
, BUSY_STAT
, WAIT_READY
)) {
955 printk(KERN_ERR
"ide-tape: Strange, packet command initiated "
956 "yet DRQ isn't asserted\n");
959 ireason
= hwif
->INB(hwif
->io_ports
.nsect_addr
);
960 while (retries
-- && ((ireason
& CD
) == 0 || (ireason
& IO
))) {
961 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while issuing "
962 "a packet command, retrying\n");
964 ireason
= hwif
->INB(hwif
->io_ports
.nsect_addr
);
966 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while "
967 "issuing a packet command, ignoring\n");
972 if ((ireason
& CD
) == 0 || (ireason
& IO
)) {
973 printk(KERN_ERR
"ide-tape: (IO,CoD) != (0,1) while issuing "
974 "a packet command\n");
975 return ide_do_reset(drive
);
977 /* Set the interrupt routine */
978 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
979 #ifdef CONFIG_BLK_DEV_IDEDMA
980 /* Begin DMA, if necessary */
981 if (pc
->flags
& PC_FLAG_DMA_IN_PROGRESS
)
982 hwif
->dma_ops
->dma_start(drive
);
984 /* Send the actual packet */
985 HWIF(drive
)->atapi_output_bytes(drive
, pc
->c
, 12);
989 static ide_startstop_t
idetape_issue_pc(ide_drive_t
*drive
,
990 struct ide_atapi_pc
*pc
)
992 ide_hwif_t
*hwif
= drive
->hwif
;
993 idetape_tape_t
*tape
= drive
->driver_data
;
997 if (tape
->pc
->c
[0] == REQUEST_SENSE
&&
998 pc
->c
[0] == REQUEST_SENSE
) {
999 printk(KERN_ERR
"ide-tape: possible ide-tape.c bug - "
1000 "Two request sense in serial were issued\n");
1003 if (tape
->failed_pc
== NULL
&& pc
->c
[0] != REQUEST_SENSE
)
1004 tape
->failed_pc
= pc
;
1005 /* Set the current packet command */
1008 if (pc
->retries
> IDETAPE_MAX_PC_RETRIES
||
1009 (pc
->flags
& PC_FLAG_ABORT
)) {
1011 * We will "abort" retrying a packet command in case legitimate
1012 * error code was received (crossing a filemark, or end of the
1013 * media, for example).
1015 if (!(pc
->flags
& PC_FLAG_ABORT
)) {
1016 if (!(pc
->c
[0] == TEST_UNIT_READY
&&
1017 tape
->sense_key
== 2 && tape
->asc
== 4 &&
1018 (tape
->ascq
== 1 || tape
->ascq
== 8))) {
1019 printk(KERN_ERR
"ide-tape: %s: I/O error, "
1020 "pc = %2x, key = %2x, "
1021 "asc = %2x, ascq = %2x\n",
1022 tape
->name
, pc
->c
[0],
1023 tape
->sense_key
, tape
->asc
,
1027 pc
->error
= IDETAPE_ERROR_GENERAL
;
1029 tape
->failed_pc
= NULL
;
1030 return pc
->idetape_callback(drive
);
1032 debug_log(DBG_SENSE
, "Retry #%d, cmd = %02X\n", pc
->retries
, pc
->c
[0]);
1035 /* We haven't transferred any data yet */
1037 pc
->cur_pos
= pc
->buf
;
1038 /* Request to transfer the entire buffer at once */
1039 bcount
= pc
->req_xfer
;
1041 if (pc
->flags
& PC_FLAG_DMA_ERROR
) {
1042 pc
->flags
&= ~PC_FLAG_DMA_ERROR
;
1043 printk(KERN_WARNING
"ide-tape: DMA disabled, "
1044 "reverting to PIO\n");
1047 if ((pc
->flags
& PC_FLAG_DMA_RECOMMENDED
) && drive
->using_dma
)
1048 dma_ok
= !hwif
->dma_ops
->dma_setup(drive
);
1050 ide_pktcmd_tf_load(drive
, IDE_TFLAG_NO_SELECT_MASK
|
1051 IDE_TFLAG_OUT_DEVICE
, bcount
, dma_ok
);
1054 /* Will begin DMA later */
1055 pc
->flags
|= PC_FLAG_DMA_IN_PROGRESS
;
1056 if (test_bit(IDETAPE_FLAG_DRQ_INTERRUPT
, &tape
->flags
)) {
1057 ide_execute_command(drive
, WIN_PACKETCMD
, &idetape_transfer_pc
,
1058 IDETAPE_WAIT_CMD
, NULL
);
1061 hwif
->OUTB(WIN_PACKETCMD
, hwif
->io_ports
.command_addr
);
1062 return idetape_transfer_pc(drive
);
1066 static ide_startstop_t
idetape_pc_callback(ide_drive_t
*drive
)
1068 idetape_tape_t
*tape
= drive
->driver_data
;
1070 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1072 idetape_end_request(drive
, tape
->pc
->error
? 0 : 1, 0);
1076 /* A mode sense command is used to "sense" tape parameters. */
1077 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc
*pc
, u8 page_code
)
1079 idetape_init_pc(pc
);
1080 pc
->c
[0] = MODE_SENSE
;
1081 if (page_code
!= IDETAPE_BLOCK_DESCRIPTOR
)
1082 /* DBD = 1 - Don't return block descriptors */
1084 pc
->c
[2] = page_code
;
1086 * Changed pc->c[3] to 0 (255 will at best return unused info).
1088 * For SCSI this byte is defined as subpage instead of high byte
1089 * of length and some IDE drives seem to interpret it this way
1090 * and return an error when 255 is used.
1093 /* We will just discard data in that case */
1095 if (page_code
== IDETAPE_BLOCK_DESCRIPTOR
)
1097 else if (page_code
== IDETAPE_CAPABILITIES_PAGE
)
1101 pc
->idetape_callback
= &idetape_pc_callback
;
1104 static ide_startstop_t
idetape_media_access_finished(ide_drive_t
*drive
)
1106 idetape_tape_t
*tape
= drive
->driver_data
;
1107 struct ide_atapi_pc
*pc
= tape
->pc
;
1110 stat
= ide_read_status(drive
);
1112 if (stat
& SEEK_STAT
) {
1113 if (stat
& ERR_STAT
) {
1114 /* Error detected */
1115 if (pc
->c
[0] != TEST_UNIT_READY
)
1116 printk(KERN_ERR
"ide-tape: %s: I/O error, ",
1118 /* Retry operation */
1119 return idetape_retry_pc(drive
);
1122 if (tape
->failed_pc
== pc
)
1123 tape
->failed_pc
= NULL
;
1125 pc
->error
= IDETAPE_ERROR_GENERAL
;
1126 tape
->failed_pc
= NULL
;
1128 return pc
->idetape_callback(drive
);
1131 static ide_startstop_t
idetape_rw_callback(ide_drive_t
*drive
)
1133 idetape_tape_t
*tape
= drive
->driver_data
;
1134 struct request
*rq
= HWGROUP(drive
)->rq
;
1135 int blocks
= tape
->pc
->xferred
/ tape
->blk_size
;
1137 tape
->avg_size
+= blocks
* tape
->blk_size
;
1139 if (time_after_eq(jiffies
, tape
->avg_time
+ HZ
)) {
1140 tape
->avg_speed
= tape
->avg_size
* HZ
/
1141 (jiffies
- tape
->avg_time
) / 1024;
1143 tape
->avg_time
= jiffies
;
1145 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1147 tape
->first_frame
+= blocks
;
1148 rq
->current_nr_sectors
-= blocks
;
1150 if (!tape
->pc
->error
)
1151 idetape_end_request(drive
, 1, 0);
1153 idetape_end_request(drive
, tape
->pc
->error
, 0);
1157 static void idetape_create_read_cmd(idetape_tape_t
*tape
,
1158 struct ide_atapi_pc
*pc
,
1159 unsigned int length
, struct idetape_bh
*bh
)
1161 idetape_init_pc(pc
);
1163 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
1165 pc
->idetape_callback
= &idetape_rw_callback
;
1167 atomic_set(&bh
->b_count
, 0);
1169 pc
->buf_size
= length
* tape
->blk_size
;
1170 pc
->req_xfer
= pc
->buf_size
;
1171 if (pc
->req_xfer
== tape
->stage_size
)
1172 pc
->flags
|= PC_FLAG_DMA_RECOMMENDED
;
1175 static void idetape_create_write_cmd(idetape_tape_t
*tape
,
1176 struct ide_atapi_pc
*pc
,
1177 unsigned int length
, struct idetape_bh
*bh
)
1179 idetape_init_pc(pc
);
1181 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
1183 pc
->idetape_callback
= &idetape_rw_callback
;
1184 pc
->flags
|= PC_FLAG_WRITING
;
1186 pc
->b_data
= bh
->b_data
;
1187 pc
->b_count
= atomic_read(&bh
->b_count
);
1189 pc
->buf_size
= length
* tape
->blk_size
;
1190 pc
->req_xfer
= pc
->buf_size
;
1191 if (pc
->req_xfer
== tape
->stage_size
)
1192 pc
->flags
|= PC_FLAG_DMA_RECOMMENDED
;
1195 static ide_startstop_t
idetape_do_request(ide_drive_t
*drive
,
1196 struct request
*rq
, sector_t block
)
1198 idetape_tape_t
*tape
= drive
->driver_data
;
1199 struct ide_atapi_pc
*pc
= NULL
;
1200 struct request
*postponed_rq
= tape
->postponed_rq
;
1203 debug_log(DBG_SENSE
, "sector: %ld, nr_sectors: %ld,"
1204 " current_nr_sectors: %d\n",
1205 rq
->sector
, rq
->nr_sectors
, rq
->current_nr_sectors
);
1207 if (!blk_special_request(rq
)) {
1208 /* We do not support buffer cache originated requests. */
1209 printk(KERN_NOTICE
"ide-tape: %s: Unsupported request in "
1210 "request queue (%d)\n", drive
->name
, rq
->cmd_type
);
1211 ide_end_request(drive
, 0, 0);
1215 /* Retry a failed packet command */
1216 if (tape
->failed_pc
&& tape
->pc
->c
[0] == REQUEST_SENSE
)
1217 return idetape_issue_pc(drive
, tape
->failed_pc
);
1219 if (postponed_rq
!= NULL
)
1220 if (rq
!= postponed_rq
) {
1221 printk(KERN_ERR
"ide-tape: ide-tape.c bug - "
1222 "Two DSC requests were queued\n");
1223 idetape_end_request(drive
, 0, 0);
1227 tape
->postponed_rq
= NULL
;
1230 * If the tape is still busy, postpone our request and service
1231 * the other device meanwhile.
1233 stat
= ide_read_status(drive
);
1235 if (!drive
->dsc_overlap
&& !(rq
->cmd
[0] & REQ_IDETAPE_PC2
))
1236 set_bit(IDETAPE_FLAG_IGNORE_DSC
, &tape
->flags
);
1238 if (drive
->post_reset
== 1) {
1239 set_bit(IDETAPE_FLAG_IGNORE_DSC
, &tape
->flags
);
1240 drive
->post_reset
= 0;
1243 if (!test_and_clear_bit(IDETAPE_FLAG_IGNORE_DSC
, &tape
->flags
) &&
1244 (stat
& SEEK_STAT
) == 0) {
1245 if (postponed_rq
== NULL
) {
1246 tape
->dsc_polling_start
= jiffies
;
1247 tape
->dsc_poll_freq
= tape
->best_dsc_rw_freq
;
1248 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_RW_TIMEOUT
;
1249 } else if (time_after(jiffies
, tape
->dsc_timeout
)) {
1250 printk(KERN_ERR
"ide-tape: %s: DSC timeout\n",
1252 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
1253 idetape_media_access_finished(drive
);
1256 return ide_do_reset(drive
);
1258 } else if (time_after(jiffies
,
1259 tape
->dsc_polling_start
+
1260 IDETAPE_DSC_MA_THRESHOLD
))
1261 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_SLOW
;
1262 idetape_postpone_request(drive
);
1265 if (rq
->cmd
[0] & REQ_IDETAPE_READ
) {
1266 pc
= idetape_next_pc_storage(drive
);
1267 idetape_create_read_cmd(tape
, pc
, rq
->current_nr_sectors
,
1268 (struct idetape_bh
*)rq
->special
);
1271 if (rq
->cmd
[0] & REQ_IDETAPE_WRITE
) {
1272 pc
= idetape_next_pc_storage(drive
);
1273 idetape_create_write_cmd(tape
, pc
, rq
->current_nr_sectors
,
1274 (struct idetape_bh
*)rq
->special
);
1277 if (rq
->cmd
[0] & REQ_IDETAPE_PC1
) {
1278 pc
= (struct ide_atapi_pc
*) rq
->buffer
;
1279 rq
->cmd
[0] &= ~(REQ_IDETAPE_PC1
);
1280 rq
->cmd
[0] |= REQ_IDETAPE_PC2
;
1283 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
1284 idetape_media_access_finished(drive
);
1289 return idetape_issue_pc(drive
, pc
);
1293 * The function below uses __get_free_pages to allocate a data buffer of size
1294 * tape->stage_size (or a bit more). We attempt to combine sequential pages as
1297 * It returns a pointer to the newly allocated buffer, or NULL in case of
1300 static idetape_stage_t
*ide_tape_kmalloc_buffer(idetape_tape_t
*tape
, int full
,
1303 idetape_stage_t
*stage
;
1304 struct idetape_bh
*prev_bh
, *bh
;
1305 int pages
= tape
->pages_per_stage
;
1306 unsigned int order
, b_allocd
;
1307 char *b_data
= NULL
;
1309 stage
= kmalloc(sizeof(idetape_stage_t
), GFP_KERNEL
);
1314 stage
->bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
1319 order
= fls(pages
) - 1;
1320 bh
->b_data
= (char *) __get_free_pages(GFP_KERNEL
, order
);
1323 b_allocd
= (1 << order
) * PAGE_SIZE
;
1327 memset(bh
->b_data
, 0, b_allocd
);
1328 bh
->b_reqnext
= NULL
;
1329 bh
->b_size
= b_allocd
;
1330 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
1333 order
= fls(pages
) - 1;
1334 b_data
= (char *) __get_free_pages(GFP_KERNEL
, order
);
1337 b_allocd
= (1 << order
) * PAGE_SIZE
;
1340 memset(b_data
, 0, b_allocd
);
1342 /* newly allocated page frames below buffer header or ...*/
1343 if (bh
->b_data
== b_data
+ b_allocd
) {
1344 bh
->b_size
+= b_allocd
;
1345 bh
->b_data
-= b_allocd
;
1347 atomic_add(b_allocd
, &bh
->b_count
);
1350 /* they are above the header */
1351 if (b_data
== bh
->b_data
+ bh
->b_size
) {
1352 bh
->b_size
+= b_allocd
;
1354 atomic_add(b_allocd
, &bh
->b_count
);
1358 bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
1360 free_pages((unsigned long) b_data
, order
);
1363 bh
->b_reqnext
= NULL
;
1364 bh
->b_data
= b_data
;
1365 bh
->b_size
= b_allocd
;
1366 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
1367 prev_bh
->b_reqnext
= bh
;
1372 bh
->b_size
-= tape
->excess_bh_size
;
1374 atomic_sub(tape
->excess_bh_size
, &bh
->b_count
);
1377 __idetape_kfree_stage(stage
);
1381 static int idetape_copy_stage_from_user(idetape_tape_t
*tape
,
1382 const char __user
*buf
, int n
)
1384 struct idetape_bh
*bh
= tape
->bh
;
1390 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
1394 count
= min((unsigned int)
1395 (bh
->b_size
- atomic_read(&bh
->b_count
)),
1397 if (copy_from_user(bh
->b_data
+ atomic_read(&bh
->b_count
), buf
,
1401 atomic_add(count
, &bh
->b_count
);
1403 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
1406 atomic_set(&bh
->b_count
, 0);
1413 static int idetape_copy_stage_to_user(idetape_tape_t
*tape
, char __user
*buf
,
1416 struct idetape_bh
*bh
= tape
->bh
;
1422 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
1426 count
= min(tape
->b_count
, n
);
1427 if (copy_to_user(buf
, tape
->b_data
, count
))
1430 tape
->b_data
+= count
;
1431 tape
->b_count
-= count
;
1433 if (!tape
->b_count
) {
1437 tape
->b_data
= bh
->b_data
;
1438 tape
->b_count
= atomic_read(&bh
->b_count
);
1445 static void idetape_init_merge_stage(idetape_tape_t
*tape
)
1447 struct idetape_bh
*bh
= tape
->merge_stage
->bh
;
1450 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
1451 atomic_set(&bh
->b_count
, 0);
1453 tape
->b_data
= bh
->b_data
;
1454 tape
->b_count
= atomic_read(&bh
->b_count
);
1458 static ide_startstop_t
idetape_read_position_callback(ide_drive_t
*drive
)
1460 idetape_tape_t
*tape
= drive
->driver_data
;
1461 u8
*readpos
= tape
->pc
->buf
;
1463 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1465 if (!tape
->pc
->error
) {
1466 debug_log(DBG_SENSE
, "BOP - %s\n",
1467 (readpos
[0] & 0x80) ? "Yes" : "No");
1468 debug_log(DBG_SENSE
, "EOP - %s\n",
1469 (readpos
[0] & 0x40) ? "Yes" : "No");
1471 if (readpos
[0] & 0x4) {
1472 printk(KERN_INFO
"ide-tape: Block location is unknown"
1474 clear_bit(IDETAPE_FLAG_ADDRESS_VALID
, &tape
->flags
);
1475 idetape_end_request(drive
, 0, 0);
1477 debug_log(DBG_SENSE
, "Block Location - %u\n",
1478 be32_to_cpu(*(u32
*)&readpos
[4]));
1480 tape
->partition
= readpos
[1];
1482 be32_to_cpu(*(u32
*)&readpos
[4]);
1483 set_bit(IDETAPE_FLAG_ADDRESS_VALID
, &tape
->flags
);
1484 idetape_end_request(drive
, 1, 0);
1487 idetape_end_request(drive
, 0, 0);
1493 * Write a filemark if write_filemark=1. Flush the device buffers without
1494 * writing a filemark otherwise.
1496 static void idetape_create_write_filemark_cmd(ide_drive_t
*drive
,
1497 struct ide_atapi_pc
*pc
, int write_filemark
)
1499 idetape_init_pc(pc
);
1500 pc
->c
[0] = WRITE_FILEMARKS
;
1501 pc
->c
[4] = write_filemark
;
1502 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1503 pc
->idetape_callback
= &idetape_pc_callback
;
1506 static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc
*pc
)
1508 idetape_init_pc(pc
);
1509 pc
->c
[0] = TEST_UNIT_READY
;
1510 pc
->idetape_callback
= &idetape_pc_callback
;
1514 * We add a special packet command request to the tail of the request queue, and
1515 * wait for it to be serviced. This is not to be called from within the request
1516 * handling part of the driver! We allocate here data on the stack and it is
1517 * valid until the request is finished. This is not the case for the bottom part
1518 * of the driver, where we are always leaving the functions to wait for an
1519 * interrupt or a timer event.
1521 * From the bottom part of the driver, we should allocate safe memory using
1522 * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request
1523 * to the request list without waiting for it to be serviced! In that case, we
1524 * usually use idetape_queue_pc_head().
1526 static int idetape_queue_pc_tail(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
)
1528 struct ide_tape_obj
*tape
= drive
->driver_data
;
1531 idetape_init_rq(&rq
, REQ_IDETAPE_PC1
);
1532 rq
.buffer
= (char *) pc
;
1533 rq
.rq_disk
= tape
->disk
;
1534 return ide_do_drive_cmd(drive
, &rq
, ide_wait
);
1537 static void idetape_create_load_unload_cmd(ide_drive_t
*drive
,
1538 struct ide_atapi_pc
*pc
, int cmd
)
1540 idetape_init_pc(pc
);
1541 pc
->c
[0] = START_STOP
;
1543 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1544 pc
->idetape_callback
= &idetape_pc_callback
;
1547 static int idetape_wait_ready(ide_drive_t
*drive
, unsigned long timeout
)
1549 idetape_tape_t
*tape
= drive
->driver_data
;
1550 struct ide_atapi_pc pc
;
1551 int load_attempted
= 0;
1553 /* Wait for the tape to become ready */
1554 set_bit(IDETAPE_FLAG_MEDIUM_PRESENT
, &tape
->flags
);
1556 while (time_before(jiffies
, timeout
)) {
1557 idetape_create_test_unit_ready_cmd(&pc
);
1558 if (!idetape_queue_pc_tail(drive
, &pc
))
1560 if ((tape
->sense_key
== 2 && tape
->asc
== 4 && tape
->ascq
== 2)
1561 || (tape
->asc
== 0x3A)) {
1565 idetape_create_load_unload_cmd(drive
, &pc
,
1566 IDETAPE_LU_LOAD_MASK
);
1567 idetape_queue_pc_tail(drive
, &pc
);
1569 /* not about to be ready */
1570 } else if (!(tape
->sense_key
== 2 && tape
->asc
== 4 &&
1571 (tape
->ascq
== 1 || tape
->ascq
== 8)))
1578 static int idetape_flush_tape_buffers(ide_drive_t
*drive
)
1580 struct ide_atapi_pc pc
;
1583 idetape_create_write_filemark_cmd(drive
, &pc
, 0);
1584 rc
= idetape_queue_pc_tail(drive
, &pc
);
1587 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1591 static void idetape_create_read_position_cmd(struct ide_atapi_pc
*pc
)
1593 idetape_init_pc(pc
);
1594 pc
->c
[0] = READ_POSITION
;
1596 pc
->idetape_callback
= &idetape_read_position_callback
;
1599 static int idetape_read_position(ide_drive_t
*drive
)
1601 idetape_tape_t
*tape
= drive
->driver_data
;
1602 struct ide_atapi_pc pc
;
1605 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1607 idetape_create_read_position_cmd(&pc
);
1608 if (idetape_queue_pc_tail(drive
, &pc
))
1610 position
= tape
->first_frame
;
1614 static void idetape_create_locate_cmd(ide_drive_t
*drive
,
1615 struct ide_atapi_pc
*pc
,
1616 unsigned int block
, u8 partition
, int skip
)
1618 idetape_init_pc(pc
);
1619 pc
->c
[0] = POSITION_TO_ELEMENT
;
1621 put_unaligned(cpu_to_be32(block
), (unsigned int *) &pc
->c
[3]);
1622 pc
->c
[8] = partition
;
1623 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1624 pc
->idetape_callback
= &idetape_pc_callback
;
1627 static int idetape_create_prevent_cmd(ide_drive_t
*drive
,
1628 struct ide_atapi_pc
*pc
, int prevent
)
1630 idetape_tape_t
*tape
= drive
->driver_data
;
1632 /* device supports locking according to capabilities page */
1633 if (!(tape
->caps
[6] & 0x01))
1636 idetape_init_pc(pc
);
1637 pc
->c
[0] = ALLOW_MEDIUM_REMOVAL
;
1639 pc
->idetape_callback
= &idetape_pc_callback
;
1643 static int __idetape_discard_read_pipeline(ide_drive_t
*drive
)
1645 idetape_tape_t
*tape
= drive
->driver_data
;
1647 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
)
1650 clear_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
);
1651 tape
->merge_stage_size
= 0;
1652 if (tape
->merge_stage
!= NULL
) {
1653 __idetape_kfree_stage(tape
->merge_stage
);
1654 tape
->merge_stage
= NULL
;
1657 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1663 * Position the tape to the requested block using the LOCATE packet command.
1664 * A READ POSITION command is then issued to check where we are positioned. Like
1665 * all higher level operations, we queue the commands at the tail of the request
1666 * queue and wait for their completion.
1668 static int idetape_position_tape(ide_drive_t
*drive
, unsigned int block
,
1669 u8 partition
, int skip
)
1671 idetape_tape_t
*tape
= drive
->driver_data
;
1673 struct ide_atapi_pc pc
;
1675 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1676 __idetape_discard_read_pipeline(drive
);
1677 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1678 idetape_create_locate_cmd(drive
, &pc
, block
, partition
, skip
);
1679 retval
= idetape_queue_pc_tail(drive
, &pc
);
1683 idetape_create_read_position_cmd(&pc
);
1684 return (idetape_queue_pc_tail(drive
, &pc
));
1687 static void idetape_discard_read_pipeline(ide_drive_t
*drive
,
1688 int restore_position
)
1690 idetape_tape_t
*tape
= drive
->driver_data
;
1694 cnt
= __idetape_discard_read_pipeline(drive
);
1695 if (restore_position
) {
1696 position
= idetape_read_position(drive
);
1697 seek
= position
> cnt
? position
- cnt
: 0;
1698 if (idetape_position_tape(drive
, seek
, 0, 0)) {
1699 printk(KERN_INFO
"ide-tape: %s: position_tape failed in"
1700 " discard_pipeline()\n", tape
->name
);
1707 * Generate a read/write request for the block device interface and wait for it
1710 static int idetape_queue_rw_tail(ide_drive_t
*drive
, int cmd
, int blocks
,
1711 struct idetape_bh
*bh
)
1713 idetape_tape_t
*tape
= drive
->driver_data
;
1716 debug_log(DBG_SENSE
, "%s: cmd=%d\n", __func__
, cmd
);
1718 idetape_init_rq(&rq
, cmd
);
1719 rq
.rq_disk
= tape
->disk
;
1720 rq
.special
= (void *)bh
;
1721 rq
.sector
= tape
->first_frame
;
1722 rq
.nr_sectors
= blocks
;
1723 rq
.current_nr_sectors
= blocks
;
1724 (void) ide_do_drive_cmd(drive
, &rq
, ide_wait
);
1726 if ((cmd
& (REQ_IDETAPE_READ
| REQ_IDETAPE_WRITE
)) == 0)
1729 if (tape
->merge_stage
)
1730 idetape_init_merge_stage(tape
);
1731 if (rq
.errors
== IDETAPE_ERROR_GENERAL
)
1733 return (tape
->blk_size
* (blocks
-rq
.current_nr_sectors
));
1736 static void idetape_create_inquiry_cmd(struct ide_atapi_pc
*pc
)
1738 idetape_init_pc(pc
);
1742 pc
->idetape_callback
= &idetape_pc_callback
;
1745 static void idetape_create_rewind_cmd(ide_drive_t
*drive
,
1746 struct ide_atapi_pc
*pc
)
1748 idetape_init_pc(pc
);
1749 pc
->c
[0] = REZERO_UNIT
;
1750 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1751 pc
->idetape_callback
= &idetape_pc_callback
;
1754 static void idetape_create_erase_cmd(struct ide_atapi_pc
*pc
)
1756 idetape_init_pc(pc
);
1759 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1760 pc
->idetape_callback
= &idetape_pc_callback
;
1763 static void idetape_create_space_cmd(struct ide_atapi_pc
*pc
, int count
, u8 cmd
)
1765 idetape_init_pc(pc
);
1767 put_unaligned(cpu_to_be32(count
), (unsigned int *) &pc
->c
[1]);
1769 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1770 pc
->idetape_callback
= &idetape_pc_callback
;
1773 /* Queue up a character device originated write request. */
1774 static int idetape_add_chrdev_write_request(ide_drive_t
*drive
, int blocks
)
1776 idetape_tape_t
*tape
= drive
->driver_data
;
1778 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1780 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
,
1781 blocks
, tape
->merge_stage
->bh
);
1784 static void idetape_empty_write_pipeline(ide_drive_t
*drive
)
1786 idetape_tape_t
*tape
= drive
->driver_data
;
1788 struct idetape_bh
*bh
;
1790 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
1791 printk(KERN_ERR
"ide-tape: bug: Trying to empty write pipeline,"
1792 " but we are not writing.\n");
1795 if (tape
->merge_stage_size
> tape
->stage_size
) {
1796 printk(KERN_ERR
"ide-tape: bug: merge_buffer too big\n");
1797 tape
->merge_stage_size
= tape
->stage_size
;
1799 if (tape
->merge_stage_size
) {
1800 blocks
= tape
->merge_stage_size
/ tape
->blk_size
;
1801 if (tape
->merge_stage_size
% tape
->blk_size
) {
1805 i
= tape
->blk_size
- tape
->merge_stage_size
%
1807 bh
= tape
->bh
->b_reqnext
;
1809 atomic_set(&bh
->b_count
, 0);
1815 printk(KERN_INFO
"ide-tape: bug,"
1819 min
= min(i
, (unsigned int)(bh
->b_size
-
1820 atomic_read(&bh
->b_count
)));
1821 memset(bh
->b_data
+ atomic_read(&bh
->b_count
),
1823 atomic_add(min
, &bh
->b_count
);
1828 (void) idetape_add_chrdev_write_request(drive
, blocks
);
1829 tape
->merge_stage_size
= 0;
1831 if (tape
->merge_stage
!= NULL
) {
1832 __idetape_kfree_stage(tape
->merge_stage
);
1833 tape
->merge_stage
= NULL
;
1835 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1838 static int idetape_init_read(ide_drive_t
*drive
)
1840 idetape_tape_t
*tape
= drive
->driver_data
;
1843 /* Initialize read operation */
1844 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
1845 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
1846 idetape_empty_write_pipeline(drive
);
1847 idetape_flush_tape_buffers(drive
);
1849 if (tape
->merge_stage
|| tape
->merge_stage_size
) {
1850 printk(KERN_ERR
"ide-tape: merge_stage_size should be"
1852 tape
->merge_stage_size
= 0;
1854 tape
->merge_stage
= ide_tape_kmalloc_buffer(tape
, 0, 0);
1855 if (!tape
->merge_stage
)
1857 tape
->chrdev_dir
= IDETAPE_DIR_READ
;
1860 * Issue a read 0 command to ensure that DSC handshake is
1861 * switched from completion mode to buffer available mode.
1862 * No point in issuing this if DSC overlap isn't supported, some
1863 * drives (Seagate STT3401A) will return an error.
1865 if (drive
->dsc_overlap
) {
1866 bytes_read
= idetape_queue_rw_tail(drive
,
1867 REQ_IDETAPE_READ
, 0,
1868 tape
->merge_stage
->bh
);
1869 if (bytes_read
< 0) {
1870 __idetape_kfree_stage(tape
->merge_stage
);
1871 tape
->merge_stage
= NULL
;
1872 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1881 /* called from idetape_chrdev_read() to service a chrdev read request. */
1882 static int idetape_add_chrdev_read_request(ide_drive_t
*drive
, int blocks
)
1884 idetape_tape_t
*tape
= drive
->driver_data
;
1886 debug_log(DBG_PROCS
, "Enter %s, %d blocks\n", __func__
, blocks
);
1888 /* If we are at a filemark, return a read length of 0 */
1889 if (test_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
))
1892 idetape_init_read(drive
);
1894 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, blocks
,
1895 tape
->merge_stage
->bh
);
1898 static void idetape_pad_zeros(ide_drive_t
*drive
, int bcount
)
1900 idetape_tape_t
*tape
= drive
->driver_data
;
1901 struct idetape_bh
*bh
;
1907 bh
= tape
->merge_stage
->bh
;
1908 count
= min(tape
->stage_size
, bcount
);
1910 blocks
= count
/ tape
->blk_size
;
1912 atomic_set(&bh
->b_count
,
1913 min(count
, (unsigned int)bh
->b_size
));
1914 memset(bh
->b_data
, 0, atomic_read(&bh
->b_count
));
1915 count
-= atomic_read(&bh
->b_count
);
1918 idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
,
1919 tape
->merge_stage
->bh
);
1924 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1925 * currently support only one partition.
1927 static int idetape_rewind_tape(ide_drive_t
*drive
)
1930 struct ide_atapi_pc pc
;
1931 idetape_tape_t
*tape
;
1932 tape
= drive
->driver_data
;
1934 debug_log(DBG_SENSE
, "Enter %s\n", __func__
);
1936 idetape_create_rewind_cmd(drive
, &pc
);
1937 retval
= idetape_queue_pc_tail(drive
, &pc
);
1941 idetape_create_read_position_cmd(&pc
);
1942 retval
= idetape_queue_pc_tail(drive
, &pc
);
1948 /* mtio.h compatible commands should be issued to the chrdev interface. */
1949 static int idetape_blkdev_ioctl(ide_drive_t
*drive
, unsigned int cmd
,
1952 idetape_tape_t
*tape
= drive
->driver_data
;
1953 void __user
*argp
= (void __user
*)arg
;
1955 struct idetape_config
{
1956 int dsc_rw_frequency
;
1957 int dsc_media_access_frequency
;
1961 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1965 if (copy_from_user(&config
, argp
, sizeof(config
)))
1967 tape
->best_dsc_rw_freq
= config
.dsc_rw_frequency
;
1970 config
.dsc_rw_frequency
= (int) tape
->best_dsc_rw_freq
;
1971 config
.nr_stages
= 1;
1972 if (copy_to_user(argp
, &config
, sizeof(config
)))
1981 static int idetape_space_over_filemarks(ide_drive_t
*drive
, short mt_op
,
1984 idetape_tape_t
*tape
= drive
->driver_data
;
1985 struct ide_atapi_pc pc
;
1986 int retval
, count
= 0;
1987 int sprev
= !!(tape
->caps
[4] & 0x20);
1991 if (MTBSF
== mt_op
|| MTBSFM
== mt_op
) {
1994 mt_count
= -mt_count
;
1997 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
1998 tape
->merge_stage_size
= 0;
1999 if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
))
2001 idetape_discard_read_pipeline(drive
, 0);
2005 * The filemark was not found in our internal pipeline; now we can issue
2006 * the space command.
2011 idetape_create_space_cmd(&pc
, mt_count
- count
,
2012 IDETAPE_SPACE_OVER_FILEMARK
);
2013 return idetape_queue_pc_tail(drive
, &pc
);
2018 retval
= idetape_space_over_filemarks(drive
, MTFSF
,
2022 count
= (MTBSFM
== mt_op
? 1 : -1);
2023 return idetape_space_over_filemarks(drive
, MTFSF
, count
);
2025 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
2032 * Our character device read / write functions.
2034 * The tape is optimized to maximize throughput when it is transferring an
2035 * integral number of the "continuous transfer limit", which is a parameter of
2036 * the specific tape (26kB on my particular tape, 32kB for Onstream).
2038 * As of version 1.3 of the driver, the character device provides an abstract
2039 * continuous view of the media - any mix of block sizes (even 1 byte) on the
2040 * same backup/restore procedure is supported. The driver will internally
2041 * convert the requests to the recommended transfer unit, so that an unmatch
2042 * between the user's block size to the recommended size will only result in a
2043 * (slightly) increased driver overhead, but will no longer hit performance.
2044 * This is not applicable to Onstream.
2046 static ssize_t
idetape_chrdev_read(struct file
*file
, char __user
*buf
,
2047 size_t count
, loff_t
*ppos
)
2049 struct ide_tape_obj
*tape
= ide_tape_f(file
);
2050 ide_drive_t
*drive
= tape
->drive
;
2051 ssize_t bytes_read
, temp
, actually_read
= 0, rc
;
2053 u16 ctl
= *(u16
*)&tape
->caps
[12];
2055 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
2057 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
2058 if (test_bit(IDETAPE_FLAG_DETECT_BS
, &tape
->flags
))
2059 if (count
> tape
->blk_size
&&
2060 (count
% tape
->blk_size
) == 0)
2061 tape
->user_bs_factor
= count
/ tape
->blk_size
;
2063 rc
= idetape_init_read(drive
);
2068 if (tape
->merge_stage_size
) {
2069 actually_read
= min((unsigned int)(tape
->merge_stage_size
),
2070 (unsigned int)count
);
2071 if (idetape_copy_stage_to_user(tape
, buf
, actually_read
))
2073 buf
+= actually_read
;
2074 tape
->merge_stage_size
-= actually_read
;
2075 count
-= actually_read
;
2077 while (count
>= tape
->stage_size
) {
2078 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
2079 if (bytes_read
<= 0)
2081 if (idetape_copy_stage_to_user(tape
, buf
, bytes_read
))
2084 count
-= bytes_read
;
2085 actually_read
+= bytes_read
;
2088 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
2089 if (bytes_read
<= 0)
2091 temp
= min((unsigned long)count
, (unsigned long)bytes_read
);
2092 if (idetape_copy_stage_to_user(tape
, buf
, temp
))
2094 actually_read
+= temp
;
2095 tape
->merge_stage_size
= bytes_read
-temp
;
2098 if (!actually_read
&& test_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
)) {
2099 debug_log(DBG_SENSE
, "%s: spacing over filemark\n", tape
->name
);
2101 idetape_space_over_filemarks(drive
, MTFSF
, 1);
2105 return ret
? ret
: actually_read
;
2108 static ssize_t
idetape_chrdev_write(struct file
*file
, const char __user
*buf
,
2109 size_t count
, loff_t
*ppos
)
2111 struct ide_tape_obj
*tape
= ide_tape_f(file
);
2112 ide_drive_t
*drive
= tape
->drive
;
2113 ssize_t actually_written
= 0;
2115 u16 ctl
= *(u16
*)&tape
->caps
[12];
2117 /* The drive is write protected. */
2118 if (tape
->write_prot
)
2121 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
2123 /* Initialize write operation */
2124 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
2125 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
2126 idetape_discard_read_pipeline(drive
, 1);
2127 if (tape
->merge_stage
|| tape
->merge_stage_size
) {
2128 printk(KERN_ERR
"ide-tape: merge_stage_size "
2129 "should be 0 now\n");
2130 tape
->merge_stage_size
= 0;
2132 tape
->merge_stage
= ide_tape_kmalloc_buffer(tape
, 0, 0);
2133 if (!tape
->merge_stage
)
2135 tape
->chrdev_dir
= IDETAPE_DIR_WRITE
;
2136 idetape_init_merge_stage(tape
);
2139 * Issue a write 0 command to ensure that DSC handshake is
2140 * switched from completion mode to buffer available mode. No
2141 * point in issuing this if DSC overlap isn't supported, some
2142 * drives (Seagate STT3401A) will return an error.
2144 if (drive
->dsc_overlap
) {
2145 ssize_t retval
= idetape_queue_rw_tail(drive
,
2146 REQ_IDETAPE_WRITE
, 0,
2147 tape
->merge_stage
->bh
);
2149 __idetape_kfree_stage(tape
->merge_stage
);
2150 tape
->merge_stage
= NULL
;
2151 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2158 if (tape
->merge_stage_size
) {
2159 if (tape
->merge_stage_size
>= tape
->stage_size
) {
2160 printk(KERN_ERR
"ide-tape: bug: merge buf too big\n");
2161 tape
->merge_stage_size
= 0;
2163 actually_written
= min((unsigned int)
2164 (tape
->stage_size
- tape
->merge_stage_size
),
2165 (unsigned int)count
);
2166 if (idetape_copy_stage_from_user(tape
, buf
, actually_written
))
2168 buf
+= actually_written
;
2169 tape
->merge_stage_size
+= actually_written
;
2170 count
-= actually_written
;
2172 if (tape
->merge_stage_size
== tape
->stage_size
) {
2174 tape
->merge_stage_size
= 0;
2175 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
2180 while (count
>= tape
->stage_size
) {
2182 if (idetape_copy_stage_from_user(tape
, buf
, tape
->stage_size
))
2184 buf
+= tape
->stage_size
;
2185 count
-= tape
->stage_size
;
2186 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
2187 actually_written
+= tape
->stage_size
;
2192 actually_written
+= count
;
2193 if (idetape_copy_stage_from_user(tape
, buf
, count
))
2195 tape
->merge_stage_size
+= count
;
2197 return ret
? ret
: actually_written
;
2200 static int idetape_write_filemark(ide_drive_t
*drive
)
2202 struct ide_atapi_pc pc
;
2204 /* Write a filemark */
2205 idetape_create_write_filemark_cmd(drive
, &pc
, 1);
2206 if (idetape_queue_pc_tail(drive
, &pc
)) {
2207 printk(KERN_ERR
"ide-tape: Couldn't write a filemark\n");
2214 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
2217 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
2218 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
2219 * usually not supported.
2221 * The following commands are currently not supported:
2223 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
2224 * MT_ST_WRITE_THRESHOLD.
2226 static int idetape_mtioctop(ide_drive_t
*drive
, short mt_op
, int mt_count
)
2228 idetape_tape_t
*tape
= drive
->driver_data
;
2229 struct ide_atapi_pc pc
;
2232 debug_log(DBG_ERR
, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
2242 return idetape_space_over_filemarks(drive
, mt_op
, mt_count
);
2249 if (tape
->write_prot
)
2251 idetape_discard_read_pipeline(drive
, 1);
2252 for (i
= 0; i
< mt_count
; i
++) {
2253 retval
= idetape_write_filemark(drive
);
2259 idetape_discard_read_pipeline(drive
, 0);
2260 if (idetape_rewind_tape(drive
))
2264 idetape_discard_read_pipeline(drive
, 0);
2265 idetape_create_load_unload_cmd(drive
, &pc
,
2266 IDETAPE_LU_LOAD_MASK
);
2267 return idetape_queue_pc_tail(drive
, &pc
);
2271 * If door is locked, attempt to unlock before
2272 * attempting to eject.
2274 if (tape
->door_locked
) {
2275 if (idetape_create_prevent_cmd(drive
, &pc
, 0))
2276 if (!idetape_queue_pc_tail(drive
, &pc
))
2277 tape
->door_locked
= DOOR_UNLOCKED
;
2279 idetape_discard_read_pipeline(drive
, 0);
2280 idetape_create_load_unload_cmd(drive
, &pc
,
2281 !IDETAPE_LU_LOAD_MASK
);
2282 retval
= idetape_queue_pc_tail(drive
, &pc
);
2284 clear_bit(IDETAPE_FLAG_MEDIUM_PRESENT
, &tape
->flags
);
2287 idetape_discard_read_pipeline(drive
, 0);
2288 return idetape_flush_tape_buffers(drive
);
2290 idetape_discard_read_pipeline(drive
, 0);
2291 idetape_create_load_unload_cmd(drive
, &pc
,
2292 IDETAPE_LU_RETENSION_MASK
| IDETAPE_LU_LOAD_MASK
);
2293 return idetape_queue_pc_tail(drive
, &pc
);
2295 idetape_create_space_cmd(&pc
, 0, IDETAPE_SPACE_TO_EOD
);
2296 return idetape_queue_pc_tail(drive
, &pc
);
2298 (void)idetape_rewind_tape(drive
);
2299 idetape_create_erase_cmd(&pc
);
2300 return idetape_queue_pc_tail(drive
, &pc
);
2303 if (mt_count
< tape
->blk_size
||
2304 mt_count
% tape
->blk_size
)
2306 tape
->user_bs_factor
= mt_count
/ tape
->blk_size
;
2307 clear_bit(IDETAPE_FLAG_DETECT_BS
, &tape
->flags
);
2309 set_bit(IDETAPE_FLAG_DETECT_BS
, &tape
->flags
);
2312 idetape_discard_read_pipeline(drive
, 0);
2313 return idetape_position_tape(drive
,
2314 mt_count
* tape
->user_bs_factor
, tape
->partition
, 0);
2316 idetape_discard_read_pipeline(drive
, 0);
2317 return idetape_position_tape(drive
, 0, mt_count
, 0);
2321 if (!idetape_create_prevent_cmd(drive
, &pc
, 1))
2323 retval
= idetape_queue_pc_tail(drive
, &pc
);
2326 tape
->door_locked
= DOOR_EXPLICITLY_LOCKED
;
2329 if (!idetape_create_prevent_cmd(drive
, &pc
, 0))
2331 retval
= idetape_queue_pc_tail(drive
, &pc
);
2334 tape
->door_locked
= DOOR_UNLOCKED
;
2337 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
2344 * Our character device ioctls. General mtio.h magnetic io commands are
2345 * supported here, and not in the corresponding block interface. Our own
2346 * ide-tape ioctls are supported on both interfaces.
2348 static int idetape_chrdev_ioctl(struct inode
*inode
, struct file
*file
,
2349 unsigned int cmd
, unsigned long arg
)
2351 struct ide_tape_obj
*tape
= ide_tape_f(file
);
2352 ide_drive_t
*drive
= tape
->drive
;
2356 int block_offset
= 0, position
= tape
->first_frame
;
2357 void __user
*argp
= (void __user
*)arg
;
2359 debug_log(DBG_CHRDEV
, "Enter %s, cmd=%u\n", __func__
, cmd
);
2361 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
2362 idetape_empty_write_pipeline(drive
);
2363 idetape_flush_tape_buffers(drive
);
2365 if (cmd
== MTIOCGET
|| cmd
== MTIOCPOS
) {
2366 block_offset
= tape
->merge_stage_size
/
2367 (tape
->blk_size
* tape
->user_bs_factor
);
2368 position
= idetape_read_position(drive
);
2374 if (copy_from_user(&mtop
, argp
, sizeof(struct mtop
)))
2376 return idetape_mtioctop(drive
, mtop
.mt_op
, mtop
.mt_count
);
2378 memset(&mtget
, 0, sizeof(struct mtget
));
2379 mtget
.mt_type
= MT_ISSCSI2
;
2380 mtget
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
2382 ((tape
->blk_size
* tape
->user_bs_factor
)
2383 << MT_ST_BLKSIZE_SHIFT
) & MT_ST_BLKSIZE_MASK
;
2385 if (tape
->drv_write_prot
)
2386 mtget
.mt_gstat
|= GMT_WR_PROT(0xffffffff);
2388 if (copy_to_user(argp
, &mtget
, sizeof(struct mtget
)))
2392 mtpos
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
2393 if (copy_to_user(argp
, &mtpos
, sizeof(struct mtpos
)))
2397 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
2398 idetape_discard_read_pipeline(drive
, 1);
2399 return idetape_blkdev_ioctl(drive
, cmd
, arg
);
2404 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
2405 * block size with the reported value.
2407 static void ide_tape_get_bsize_from_bdesc(ide_drive_t
*drive
)
2409 idetape_tape_t
*tape
= drive
->driver_data
;
2410 struct ide_atapi_pc pc
;
2412 idetape_create_mode_sense_cmd(&pc
, IDETAPE_BLOCK_DESCRIPTOR
);
2413 if (idetape_queue_pc_tail(drive
, &pc
)) {
2414 printk(KERN_ERR
"ide-tape: Can't get block descriptor\n");
2415 if (tape
->blk_size
== 0) {
2416 printk(KERN_WARNING
"ide-tape: Cannot deal with zero "
2417 "block size, assuming 32k\n");
2418 tape
->blk_size
= 32768;
2422 tape
->blk_size
= (pc
.buf
[4 + 5] << 16) +
2423 (pc
.buf
[4 + 6] << 8) +
2425 tape
->drv_write_prot
= (pc
.buf
[2] & 0x80) >> 7;
2428 static int idetape_chrdev_open(struct inode
*inode
, struct file
*filp
)
2430 unsigned int minor
= iminor(inode
), i
= minor
& ~0xc0;
2432 idetape_tape_t
*tape
;
2433 struct ide_atapi_pc pc
;
2436 if (i
>= MAX_HWIFS
* MAX_DRIVES
)
2439 tape
= ide_tape_chrdev_get(i
);
2443 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
2446 * We really want to do nonseekable_open(inode, filp); here, but some
2447 * versions of tar incorrectly call lseek on tapes and bail out if that
2448 * fails. So we disallow pread() and pwrite(), but permit lseeks.
2450 filp
->f_mode
&= ~(FMODE_PREAD
| FMODE_PWRITE
);
2452 drive
= tape
->drive
;
2454 filp
->private_data
= tape
;
2456 if (test_and_set_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
)) {
2461 retval
= idetape_wait_ready(drive
, 60 * HZ
);
2463 clear_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
);
2464 printk(KERN_ERR
"ide-tape: %s: drive not ready\n", tape
->name
);
2468 idetape_read_position(drive
);
2469 if (!test_bit(IDETAPE_FLAG_ADDRESS_VALID
, &tape
->flags
))
2470 (void)idetape_rewind_tape(drive
);
2472 /* Read block size and write protect status from drive. */
2473 ide_tape_get_bsize_from_bdesc(drive
);
2475 /* Set write protect flag if device is opened as read-only. */
2476 if ((filp
->f_flags
& O_ACCMODE
) == O_RDONLY
)
2477 tape
->write_prot
= 1;
2479 tape
->write_prot
= tape
->drv_write_prot
;
2481 /* Make sure drive isn't write protected if user wants to write. */
2482 if (tape
->write_prot
) {
2483 if ((filp
->f_flags
& O_ACCMODE
) == O_WRONLY
||
2484 (filp
->f_flags
& O_ACCMODE
) == O_RDWR
) {
2485 clear_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
);
2491 /* Lock the tape drive door so user can't eject. */
2492 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
2493 if (idetape_create_prevent_cmd(drive
, &pc
, 1)) {
2494 if (!idetape_queue_pc_tail(drive
, &pc
)) {
2495 if (tape
->door_locked
!= DOOR_EXPLICITLY_LOCKED
)
2496 tape
->door_locked
= DOOR_LOCKED
;
2507 static void idetape_write_release(ide_drive_t
*drive
, unsigned int minor
)
2509 idetape_tape_t
*tape
= drive
->driver_data
;
2511 idetape_empty_write_pipeline(drive
);
2512 tape
->merge_stage
= ide_tape_kmalloc_buffer(tape
, 1, 0);
2513 if (tape
->merge_stage
!= NULL
) {
2514 idetape_pad_zeros(drive
, tape
->blk_size
*
2515 (tape
->user_bs_factor
- 1));
2516 __idetape_kfree_stage(tape
->merge_stage
);
2517 tape
->merge_stage
= NULL
;
2519 idetape_write_filemark(drive
);
2520 idetape_flush_tape_buffers(drive
);
2521 idetape_flush_tape_buffers(drive
);
2524 static int idetape_chrdev_release(struct inode
*inode
, struct file
*filp
)
2526 struct ide_tape_obj
*tape
= ide_tape_f(filp
);
2527 ide_drive_t
*drive
= tape
->drive
;
2528 struct ide_atapi_pc pc
;
2529 unsigned int minor
= iminor(inode
);
2532 tape
= drive
->driver_data
;
2534 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
2536 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
2537 idetape_write_release(drive
, minor
);
2538 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
2540 idetape_discard_read_pipeline(drive
, 1);
2543 if (minor
< 128 && test_bit(IDETAPE_FLAG_MEDIUM_PRESENT
, &tape
->flags
))
2544 (void) idetape_rewind_tape(drive
);
2545 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
2546 if (tape
->door_locked
== DOOR_LOCKED
) {
2547 if (idetape_create_prevent_cmd(drive
, &pc
, 0)) {
2548 if (!idetape_queue_pc_tail(drive
, &pc
))
2549 tape
->door_locked
= DOOR_UNLOCKED
;
2553 clear_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
);
2560 * check the contents of the ATAPI IDENTIFY command results. We return:
2562 * 1 - If the tape can be supported by us, based on the information we have so
2565 * 0 - If this tape driver is not currently supported by us.
2567 static int idetape_identify_device(ide_drive_t
*drive
)
2569 u8 gcw
[2], protocol
, device_type
, removable
, packet_size
;
2571 if (drive
->id_read
== 0)
2574 *((unsigned short *) &gcw
) = drive
->id
->config
;
2576 protocol
= (gcw
[1] & 0xC0) >> 6;
2577 device_type
= gcw
[1] & 0x1F;
2578 removable
= !!(gcw
[0] & 0x80);
2579 packet_size
= gcw
[0] & 0x3;
2581 /* Check that we can support this device */
2583 printk(KERN_ERR
"ide-tape: Protocol (0x%02x) is not ATAPI\n",
2585 else if (device_type
!= 1)
2586 printk(KERN_ERR
"ide-tape: Device type (0x%02x) is not set "
2587 "to tape\n", device_type
);
2588 else if (!removable
)
2589 printk(KERN_ERR
"ide-tape: The removable flag is not set\n");
2590 else if (packet_size
!= 0) {
2591 printk(KERN_ERR
"ide-tape: Packet size (0x%02x) is not 12"
2592 " bytes\n", packet_size
);
2598 static void idetape_get_inquiry_results(ide_drive_t
*drive
)
2600 idetape_tape_t
*tape
= drive
->driver_data
;
2601 struct ide_atapi_pc pc
;
2602 char fw_rev
[6], vendor_id
[10], product_id
[18];
2604 idetape_create_inquiry_cmd(&pc
);
2605 if (idetape_queue_pc_tail(drive
, &pc
)) {
2606 printk(KERN_ERR
"ide-tape: %s: can't get INQUIRY results\n",
2610 memcpy(vendor_id
, &pc
.buf
[8], 8);
2611 memcpy(product_id
, &pc
.buf
[16], 16);
2612 memcpy(fw_rev
, &pc
.buf
[32], 4);
2614 ide_fixstring(vendor_id
, 10, 0);
2615 ide_fixstring(product_id
, 18, 0);
2616 ide_fixstring(fw_rev
, 6, 0);
2618 printk(KERN_INFO
"ide-tape: %s <-> %s: %s %s rev %s\n",
2619 drive
->name
, tape
->name
, vendor_id
, product_id
, fw_rev
);
2623 * Ask the tape about its various parameters. In particular, we will adjust our
2624 * data transfer buffer size to the recommended value as returned by the tape.
2626 static void idetape_get_mode_sense_results(ide_drive_t
*drive
)
2628 idetape_tape_t
*tape
= drive
->driver_data
;
2629 struct ide_atapi_pc pc
;
2631 u8 speed
, max_speed
;
2633 idetape_create_mode_sense_cmd(&pc
, IDETAPE_CAPABILITIES_PAGE
);
2634 if (idetape_queue_pc_tail(drive
, &pc
)) {
2635 printk(KERN_ERR
"ide-tape: Can't get tape parameters - assuming"
2636 " some default values\n");
2637 tape
->blk_size
= 512;
2638 put_unaligned(52, (u16
*)&tape
->caps
[12]);
2639 put_unaligned(540, (u16
*)&tape
->caps
[14]);
2640 put_unaligned(6*52, (u16
*)&tape
->caps
[16]);
2643 caps
= pc
.buf
+ 4 + pc
.buf
[3];
2645 /* convert to host order and save for later use */
2646 speed
= be16_to_cpu(*(u16
*)&caps
[14]);
2647 max_speed
= be16_to_cpu(*(u16
*)&caps
[8]);
2649 put_unaligned(max_speed
, (u16
*)&caps
[8]);
2650 put_unaligned(be16_to_cpu(*(u16
*)&caps
[12]), (u16
*)&caps
[12]);
2651 put_unaligned(speed
, (u16
*)&caps
[14]);
2652 put_unaligned(be16_to_cpu(*(u16
*)&caps
[16]), (u16
*)&caps
[16]);
2655 printk(KERN_INFO
"ide-tape: %s: invalid tape speed "
2656 "(assuming 650KB/sec)\n", drive
->name
);
2657 put_unaligned(650, (u16
*)&caps
[14]);
2660 printk(KERN_INFO
"ide-tape: %s: invalid max_speed "
2661 "(assuming 650KB/sec)\n", drive
->name
);
2662 put_unaligned(650, (u16
*)&caps
[8]);
2665 memcpy(&tape
->caps
, caps
, 20);
2667 tape
->blk_size
= 512;
2668 else if (caps
[7] & 0x04)
2669 tape
->blk_size
= 1024;
2672 #ifdef CONFIG_IDE_PROC_FS
2673 static void idetape_add_settings(ide_drive_t
*drive
)
2675 idetape_tape_t
*tape
= drive
->driver_data
;
2677 ide_add_setting(drive
, "buffer", SETTING_READ
, TYPE_SHORT
, 0, 0xffff,
2678 1, 2, (u16
*)&tape
->caps
[16], NULL
);
2679 ide_add_setting(drive
, "speed", SETTING_READ
, TYPE_SHORT
, 0, 0xffff,
2680 1, 1, (u16
*)&tape
->caps
[14], NULL
);
2681 ide_add_setting(drive
, "stage", SETTING_READ
, TYPE_INT
, 0, 0xffff, 1,
2682 1024, &tape
->stage_size
, NULL
);
2683 ide_add_setting(drive
, "tdsc", SETTING_RW
, TYPE_INT
, IDETAPE_DSC_RW_MIN
,
2684 IDETAPE_DSC_RW_MAX
, 1000, HZ
, &tape
->best_dsc_rw_freq
,
2686 ide_add_setting(drive
, "dsc_overlap", SETTING_RW
, TYPE_BYTE
, 0, 1, 1,
2687 1, &drive
->dsc_overlap
, NULL
);
2688 ide_add_setting(drive
, "avg_speed", SETTING_READ
, TYPE_INT
, 0, 0xffff,
2689 1, 1, &tape
->avg_speed
, NULL
);
2690 ide_add_setting(drive
, "debug_mask", SETTING_RW
, TYPE_INT
, 0, 0xffff, 1,
2691 1, &tape
->debug_mask
, NULL
);
2694 static inline void idetape_add_settings(ide_drive_t
*drive
) { ; }
2698 * The function below is called to:
2700 * 1. Initialize our various state variables.
2701 * 2. Ask the tape for its capabilities.
2702 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2703 * is chosen based on the recommendation which we received in step 2.
2705 * Note that at this point ide.c already assigned us an irq, so that we can
2706 * queue requests here and wait for their completion.
2708 static void idetape_setup(ide_drive_t
*drive
, idetape_tape_t
*tape
, int minor
)
2714 u16
*ctl
= (u16
*)&tape
->caps
[12];
2716 spin_lock_init(&tape
->lock
);
2717 drive
->dsc_overlap
= 1;
2718 if (drive
->hwif
->host_flags
& IDE_HFLAG_NO_DSC
) {
2719 printk(KERN_INFO
"ide-tape: %s: disabling DSC overlap\n",
2721 drive
->dsc_overlap
= 0;
2723 /* Seagate Travan drives do not support DSC overlap. */
2724 if (strstr(drive
->id
->model
, "Seagate STT3401"))
2725 drive
->dsc_overlap
= 0;
2726 tape
->minor
= minor
;
2727 tape
->name
[0] = 'h';
2728 tape
->name
[1] = 't';
2729 tape
->name
[2] = '0' + minor
;
2730 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2731 tape
->pc
= tape
->pc_stack
;
2732 *((unsigned short *) &gcw
) = drive
->id
->config
;
2734 /* Command packet DRQ type */
2735 if (((gcw
[0] & 0x60) >> 5) == 1)
2736 set_bit(IDETAPE_FLAG_DRQ_INTERRUPT
, &tape
->flags
);
2738 idetape_get_inquiry_results(drive
);
2739 idetape_get_mode_sense_results(drive
);
2740 ide_tape_get_bsize_from_bdesc(drive
);
2741 tape
->user_bs_factor
= 1;
2742 tape
->stage_size
= *ctl
* tape
->blk_size
;
2743 while (tape
->stage_size
> 0xffff) {
2744 printk(KERN_NOTICE
"ide-tape: decreasing stage size\n");
2746 tape
->stage_size
= *ctl
* tape
->blk_size
;
2748 stage_size
= tape
->stage_size
;
2749 tape
->pages_per_stage
= stage_size
/ PAGE_SIZE
;
2750 if (stage_size
% PAGE_SIZE
) {
2751 tape
->pages_per_stage
++;
2752 tape
->excess_bh_size
= PAGE_SIZE
- stage_size
% PAGE_SIZE
;
2755 /* select the "best" DSC read/write polling freq */
2756 speed
= max(*(u16
*)&tape
->caps
[14], *(u16
*)&tape
->caps
[8]);
2758 t
= (IDETAPE_FIFO_THRESHOLD
* tape
->stage_size
* HZ
) / (speed
* 1000);
2761 * Ensure that the number we got makes sense; limit it within
2762 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2764 tape
->best_dsc_rw_freq
= max_t(unsigned long,
2765 min_t(unsigned long, t
, IDETAPE_DSC_RW_MAX
),
2766 IDETAPE_DSC_RW_MIN
);
2767 printk(KERN_INFO
"ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2769 drive
->name
, tape
->name
, *(u16
*)&tape
->caps
[14],
2770 (*(u16
*)&tape
->caps
[16] * 512) / tape
->stage_size
,
2771 tape
->stage_size
/ 1024,
2772 tape
->best_dsc_rw_freq
* 1000 / HZ
,
2773 drive
->using_dma
? ", DMA":"");
2775 idetape_add_settings(drive
);
2778 static void ide_tape_remove(ide_drive_t
*drive
)
2780 idetape_tape_t
*tape
= drive
->driver_data
;
2782 ide_proc_unregister_driver(drive
, tape
->driver
);
2784 ide_unregister_region(tape
->disk
);
2789 static void ide_tape_release(struct kref
*kref
)
2791 struct ide_tape_obj
*tape
= to_ide_tape(kref
);
2792 ide_drive_t
*drive
= tape
->drive
;
2793 struct gendisk
*g
= tape
->disk
;
2795 BUG_ON(tape
->merge_stage_size
);
2797 drive
->dsc_overlap
= 0;
2798 drive
->driver_data
= NULL
;
2799 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
));
2800 device_destroy(idetape_sysfs_class
,
2801 MKDEV(IDETAPE_MAJOR
, tape
->minor
+ 128));
2802 idetape_devs
[tape
->minor
] = NULL
;
2803 g
->private_data
= NULL
;
2808 #ifdef CONFIG_IDE_PROC_FS
2809 static int proc_idetape_read_name
2810 (char *page
, char **start
, off_t off
, int count
, int *eof
, void *data
)
2812 ide_drive_t
*drive
= (ide_drive_t
*) data
;
2813 idetape_tape_t
*tape
= drive
->driver_data
;
2817 len
= sprintf(out
, "%s\n", tape
->name
);
2818 PROC_IDE_READ_RETURN(page
, start
, off
, count
, eof
, len
);
2821 static ide_proc_entry_t idetape_proc
[] = {
2822 { "capacity", S_IFREG
|S_IRUGO
, proc_ide_read_capacity
, NULL
},
2823 { "name", S_IFREG
|S_IRUGO
, proc_idetape_read_name
, NULL
},
2824 { NULL
, 0, NULL
, NULL
}
2828 static int ide_tape_probe(ide_drive_t
*);
2830 static ide_driver_t idetape_driver
= {
2832 .owner
= THIS_MODULE
,
2834 .bus
= &ide_bus_type
,
2836 .probe
= ide_tape_probe
,
2837 .remove
= ide_tape_remove
,
2838 .version
= IDETAPE_VERSION
,
2840 .supports_dsc_overlap
= 1,
2841 .do_request
= idetape_do_request
,
2842 .end_request
= idetape_end_request
,
2843 .error
= __ide_error
,
2844 .abort
= __ide_abort
,
2845 #ifdef CONFIG_IDE_PROC_FS
2846 .proc
= idetape_proc
,
2850 /* Our character device supporting functions, passed to register_chrdev. */
2851 static const struct file_operations idetape_fops
= {
2852 .owner
= THIS_MODULE
,
2853 .read
= idetape_chrdev_read
,
2854 .write
= idetape_chrdev_write
,
2855 .ioctl
= idetape_chrdev_ioctl
,
2856 .open
= idetape_chrdev_open
,
2857 .release
= idetape_chrdev_release
,
2860 static int idetape_open(struct inode
*inode
, struct file
*filp
)
2862 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
2863 struct ide_tape_obj
*tape
;
2865 tape
= ide_tape_get(disk
);
2872 static int idetape_release(struct inode
*inode
, struct file
*filp
)
2874 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
2875 struct ide_tape_obj
*tape
= ide_tape_g(disk
);
2882 static int idetape_ioctl(struct inode
*inode
, struct file
*file
,
2883 unsigned int cmd
, unsigned long arg
)
2885 struct block_device
*bdev
= inode
->i_bdev
;
2886 struct ide_tape_obj
*tape
= ide_tape_g(bdev
->bd_disk
);
2887 ide_drive_t
*drive
= tape
->drive
;
2888 int err
= generic_ide_ioctl(drive
, file
, bdev
, cmd
, arg
);
2890 err
= idetape_blkdev_ioctl(drive
, cmd
, arg
);
2894 static struct block_device_operations idetape_block_ops
= {
2895 .owner
= THIS_MODULE
,
2896 .open
= idetape_open
,
2897 .release
= idetape_release
,
2898 .ioctl
= idetape_ioctl
,
2901 static int ide_tape_probe(ide_drive_t
*drive
)
2903 idetape_tape_t
*tape
;
2907 if (!strstr("ide-tape", drive
->driver_req
))
2909 if (!drive
->present
)
2911 if (drive
->media
!= ide_tape
)
2913 if (!idetape_identify_device(drive
)) {
2914 printk(KERN_ERR
"ide-tape: %s: not supported by this version of"
2915 " the driver\n", drive
->name
);
2919 printk(KERN_INFO
"ide-tape: passing drive %s to ide-scsi"
2920 " emulation.\n", drive
->name
);
2923 tape
= kzalloc(sizeof(idetape_tape_t
), GFP_KERNEL
);
2925 printk(KERN_ERR
"ide-tape: %s: Can't allocate a tape struct\n",
2930 g
= alloc_disk(1 << PARTN_BITS
);
2934 ide_init_disk(g
, drive
);
2936 ide_proc_register_driver(drive
, &idetape_driver
);
2938 kref_init(&tape
->kref
);
2940 tape
->drive
= drive
;
2941 tape
->driver
= &idetape_driver
;
2944 g
->private_data
= &tape
->driver
;
2946 drive
->driver_data
= tape
;
2948 mutex_lock(&idetape_ref_mutex
);
2949 for (minor
= 0; idetape_devs
[minor
]; minor
++)
2951 idetape_devs
[minor
] = tape
;
2952 mutex_unlock(&idetape_ref_mutex
);
2954 idetape_setup(drive
, tape
, minor
);
2956 device_create(idetape_sysfs_class
, &drive
->gendev
,
2957 MKDEV(IDETAPE_MAJOR
, minor
), "%s", tape
->name
);
2958 device_create(idetape_sysfs_class
, &drive
->gendev
,
2959 MKDEV(IDETAPE_MAJOR
, minor
+ 128), "n%s", tape
->name
);
2961 g
->fops
= &idetape_block_ops
;
2962 ide_register_region(g
);
2972 static void __exit
idetape_exit(void)
2974 driver_unregister(&idetape_driver
.gen_driver
);
2975 class_destroy(idetape_sysfs_class
);
2976 unregister_chrdev(IDETAPE_MAJOR
, "ht");
2979 static int __init
idetape_init(void)
2982 idetape_sysfs_class
= class_create(THIS_MODULE
, "ide_tape");
2983 if (IS_ERR(idetape_sysfs_class
)) {
2984 idetape_sysfs_class
= NULL
;
2985 printk(KERN_ERR
"Unable to create sysfs class for ide tapes\n");
2990 if (register_chrdev(IDETAPE_MAJOR
, "ht", &idetape_fops
)) {
2991 printk(KERN_ERR
"ide-tape: Failed to register chrdev"
2994 goto out_free_class
;
2997 error
= driver_register(&idetape_driver
.gen_driver
);
2999 goto out_free_driver
;
3004 driver_unregister(&idetape_driver
.gen_driver
);
3006 class_destroy(idetape_sysfs_class
);
3011 MODULE_ALIAS("ide:*m-tape*");
3012 module_init(idetape_init
);
3013 module_exit(idetape_exit
);
3014 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR
);
3015 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
3016 MODULE_LICENSE("GPL");